Advanced MIMO interleaving

Abstract

A MIMO transmitter including an interleaving system for parsing encoded bits to a plurality of spatial streams and a plurality of interleavers to interleave bits for spatial streams such that at least a first spatial stream uses a first stream interleaver that interleaves with a pattern distinct from a second stream interleaver interleaving for a second spatial stream.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority from U.S. Provisional Patent Application Nos. 60 / 585,246 filed Jul. 1, 2004 entitled MIMO INTERLEAVING, 60 / 589,390 filed Jul. 19, 2004 entitled ADVANCED MIMO INTERLEAVING, and 60 / 600,962 filed Aug. 11, 2004 entitled ADVANCED MIMO INTERLEAVING, which are hereby incorporated by reference, as if set forth in full in this document, for all purposes.BACKGROUND OF THE INVENTION [0002] Wireless networks have become increasingly popular, as computers and other devices can be coupled for data communications without requiring wired connections between the network nodes. Because wireless networks are expected to operate in unfavorable conditions, such as in the presence of reflections, interference, movement of receivers / transmitters, etc., much effort is needed to correctly transmit and receive data over a wireless channel. [0003] A typical node in a wireless network (referred to in the standards as a “station”) i...

AI Technical Summary

Benefits of technology

[0013] An improved interleaver is provided as set forth herein. In one aspect, enhanced interleaving gain is provided with the improved interleaver. The improved gain can result from increasing distances between adjacent bits or next adjacent bits, or both. Since adjacent tones see similar fading, interleaving data bits on tones that are more separated results in better performance. With more separation, the error correction is more capable of correcting bits that are surrounded by good bits.

Problems solved by technology

Because wireless networks are expected to operate in unfavorable conditions, such as in the presence of reflections, interference, movement of receivers / transmitters, etc., much effort is needed to correctly transmit and receive data over a wireless channel.

Of course, where there are unrecoverable errors, there is a mismatch between what the sending transmit chain received and what the receiving receive chain outputs.

Error correction cannot correct all errors, so even some error conditions might cause unrecoverable errors.

However, if more than three of the transmitted bits are lost, the full information cannot be recovered.

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